Fractional horsepower motors with selectable winding windows

Abstract

One disclosed motor includes winding leg and yoke laminations that form a core yoke section and a core winding leg (or coil core). An excitation coil is supported on the coil core; and the coil core and core yoke are relatively oriented so that a first surface of the original strip material faces one direction in the core yoke section, and an opposite direction in the winding leg section in a finished motor. The geometrical configuration of the laminations prevent a random location of winding legs relative to yoke laminations, and yet permits two distinctly different relative lamination orientations. A longitudinal reference line along the winding leg is identified and keying or interlocking means are symmetrical about the reference line, but a winding accommodating portion of the winding leg is asymmetrical about the same reference line, so two distinct winding window openings may be provided, depending on the orientation of the winding leg.

What I claim as new and desire to secure by Letters Patent of the United States is: 
     
       1. A dynamoelectric machine comprising a generally U-shaped core section, and a longitudinally extending coil core having winding turns accommodated thereon; said U-shaped core section and said longitudinally extending coil core both being provided with interlocking means that are symmetrical about a first given longitudinally extending reference line so that the coil core may be assembled with the U-shaped core section in either of two inverted relative positions, and yet so that the interlocking means of the coil core will interface, along the entire extent thereof, with the U-shaped core section in both of the two inverted relative positions; the longitudinally extending section of said coil core having winding turns accommodated thereon being asymmetrical relative to the reference line so that a winding accommodating space between the bight of the U-shaped core and the coil core is dependent on the relative orientation of the coil core, about the reference line, to the U-shaped core section. 
     
     
       2. The dynamoelectric machine of claim 1 wherein the interlocking means on the coil core comprise at least one enlarged end having an arcuately extending surface. 
     
     
       3. The dynamoelectric machine of claim 2 wherein the coil accommodating portion of the coil core is offset relative to the at least one enlarged end portion thereof. 
     
     
       4. A fractional horsepower motor including a pair of yoke legs and a coil core extending longitudinally between said legs; said legs having interlocking means that are symmetrical about a longitudinally extending reference line, and said coil core having keying means at the ends thereof that are symmetrical about the same longitudinally extending reference line and that interfit with said interlocking means when oriented relative thereto in either a first relative position or a second relative position inverted with respect to the first relative position; said coil core keying means interfacing with the yoke legs along the entire extent thereof in both the first and second relative position, the portion of said coil core located between the interlocking means being asymmetrical about said reference line whereby a winding window established in the core may be selectively chosen to be of a predetermined size by orienting the coil core selectively in one of said first and second relative positions. 
     
     
       5. The dynamoelectric machine of claim 4 wherein the coil core and the yoke legs are comprised of a plurality of magnetizable laminations. 
     
     
       6. A dynamoelectric machine comprising a generally U-shaped core section comprised of core section laminations having a rotor receiving region, and a longitudinally extending coil core comprising coil core laminations and having winding turns accommodated thereon; said U-shaped core section and said longitudinally extending coil core both being provided with interlocking means that are generally symmetrical about a first given longitudinally extending reference line whereby coil core laminations and core section laminations may be produced from a given strip of material while in a first relative orientation with the coil core laminations completely interfaced at the ends thereof with the core section laminations and yet be assembled together as part of cores in an inverted relative orientation with the coil core laminations completely interfaced at the ends thereof with the core section laminations; said coil core laminations having a major portion thereof disposed between the reference line and the rotor receiving region while in the first relative orientation with respect to the core section laminations; but said coil core and core sections being assembled together with the laminations thereof in the inverted relative orientation and thereby mutually establishing a winding accommodating space between the bight of the U-shaped core and the coil core, with the major portion of the coil core laminations disposed on one side of the reference line and the rotor receiving region of the core section disposed on the other side of the reference line; and said coil core laminations being completely interfaced at the ends thereof with the core section laminations.